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Synthesis of KCoPO4, physical and photoelectrochemical characterizations: application to the photodegradation of methyl violet

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Abstract

KCoPO4 was synthetized by hydrothermal route at 453 K and characterized by X-ray diffraction (XRD), FTIR spectroscopy, SEM/EDX analysis and diffuse reflectance. The XRD pattern is characteristic of a single phase, crystallizing in a hexagonal structure with lattice constants: a = 18.293 (0) Å and c = 8.466 (7) Å. The optical study showed an electronic transition at 1.82 eV, directly allowed, assigned to the crystal field splitting of the high spin Co2+: 3d7 tetrahedral bonded. The SEM image displays a homogeneous morphology with regular grains and similar sizes of ~ 90 µm while the FTIR spectrum exhibits the characteristic peaks of (PO4)3− entities and Co–O bond. The electrochemical stability in Na2SO4 (0.1 M) solution is supported by a small exchange current density (16 µA cm−2) and a polarization resistance of 71.5 kΩ cm2. The photo-electrochemistry was studied for the first time. The dependence of the interfacial capacitance (C−2) on the potential (E) showed a straight line positively slopped, characteristic of n-type behavior. A flat band potential (Efb) of 0.62 VSCE and an electron density of 1.5 × 1016 cm−3 were determined. The semicircle in the electrochemical impedance spectroscopy (EIS) is due to the charge transfer (10.6 kΩ cm2) which decreases down to 3.36 kΩ cm2 under visible light, corroborating the semi-conductivity of the phosphate. As application, the phosphate was experimented for the Methyl Violet (MV) oxidation, an abatement of ~ 92% was obtained under visible light with a flux of 23 mW cm−2. The as-prepared material shows a good stability and reusability after three consecutive tests with a deactivation effect of only 2%.

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Acknowledgements

The authors would like to thank Dr. Amar Manseri for his technical assistance in the SEM/EDX analysis.

Funding

This work was supported by the Faculty of Chemistry Grant N° B00L01UN160420190020 (USTHB; Algiers).

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Authors and Affiliations

  1. Laboratory of Electrochemistry-Corrosion, Metallurgy and Inorganic Chemistry, Faculty of Chemistry, USTHB, BP 32, 16111, Algiers, Algeria

    R. Bagtache, A. M. Djaballah & S. Tartaya

  2. Laboratory of Storage and Valorization of Renewable Energies, Faculty of Chemistry, USTHB, BP 32, 16111, Algiers, Algeria

    M. Trari

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RB wrote the draft manuscript and analyzed the article. AMD did the electrochemistry measurement. ST drew the application graphs. MT wrote and edited the manuscript.

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Correspondence to R. Bagtache or M. Trari.

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Bagtache, R., Djaballah, A.M., Tartaya, S. et al. Synthesis of KCoPO4, physical and photoelectrochemical characterizations: application to the photodegradation of methyl violet. J Mater Sci: Mater Electron 33, 23682–23692 (2022). https://doi.org/10.1007/s10854-022-09127-3

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